Preliminary data on adult sex-ratio inPhyllognathus excavatus (Coleoptera: Scarabaeidae) in central Italy

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Published:
Dec 30, 2021
Issue
Vol. 21 No. 2 (2021)
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Luca Luiselli
Institute for Development, Ecology, Conservation and Cooperation, via G. Tomasi di Lampedusa 33, Rome, I-00144, Italy, Department of Zoology, University of Lomé, Lomé, Togo
Marina Giustini
Cooperativa Spazio Libero, Largo Pannonia 42, Rome, 00183, Italy
Raffaele Luiselli
via Olona 7, Rome, 00198, Italy

Keywords : Scarabaeoidea, Dynastinae, Pentodontini, adult sex-ratio, Italy.
Abstract
The adult sex-ratio of a widespread dynastine beetle characterized by remarkable sexual shape dimorphism, Phyllognathus excavatus (Forster, 1771), is reported herein for the first time with regards to the Italian populations. These beetles were studied in a coastal locality of Mediterranean central Italy (Latium), and showed a significantly female-biased sex ratio (4.2 females for each male), with a daily sex-ratio fluctuating from equality to 7:1 towards females. Comparisons are presented with sex-ratios of other dynastine beetles studied elsewhere.

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